Re: embedded profiles in PDF/Postscript
Re: embedded profiles in PDF/Postscript
- Subject: Re: embedded profiles in PDF/Postscript
- From: Chris Murphy <email@hidden>
- Date: Mon, 7 Jun 2004 11:07:14 -0600
On Jun 6, 2004, at 9:01 PM, Graeme Gill wrote:
Roger Breton wrote:
Yes, that is fine and dandy but this really leaves me on my appetite
for
color management leadership. So the real color hero of the PDF/X
standard is
PDF/X-3 because in X/3 the CMYK OutputIntent must be specified and
will be
used to carry the final CMYK separations.
My understanding is that the destination profile is not embedded in
the PDF in any
standard "color profile" way, but is embedded in the PDF Meta Data.
It's certainly
possible to write tools that work with this convention, but it's not a
standard
in the same sense as images in the PDF itself, being tagged with their
colorspace.
The various PDF/X specification describe exactly when and how to do
this. If there is any device independent data in PDF/X-3 in particular,
the full destination ICC profile does get embedded as part of the
OutputIntent. I think the preferred practice is to fully embed the
profile if it's not based on TR001. In the case of PDF/X-3, the
OutputIntent is also the source profile for untagged objects so it is
an important piece of information.
In addition, the ICC registry isn't very useable as a way of nominating
an immediately accessible output profile. The ICC registry consists of
a
(human readable only) list of contact information, which indicates who
to contact to
obtain the required color information (possibly for a fee). It's
certainly
far from something like a repository of ICC profiles that could be
automatically
downloaded by an application wanting to resolve a registry reference.
Right. I think that should change.
Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0-201-77340-6)
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